Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 15: Poster I

A 15.5: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent A

Central energy shift in two-photon ionization process — •Hao Liang and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany

In photo-ionization process, the energy of photoelectron is equal to photo energy minus ionization potential. However, if the photon has a finite spectrum width, there would be an additional negative shift for the central energy of photoelectron respect to that of photo spectrum due to the decreasing photo-ionization cross section. Such shift is not easy to be observed in usual scheme. Here we proposed that one can measure it with reconstruction of attosecond harmonic beating by interference of two-photon transition techniques (RABBITT) for two-photon ionization process. By numerically solving the time-dependent Schrödinger equation, we found such central energy shift changes for different phase delays, spectrum width ratios and intensity ratios. With the two-photon perturbative theory, one can understand those phenomenon quantitatively. Finally, we found that the measurement of energy shift provides a way to determine two independent ionization time-delays in two-photon ionization process.

Keywords: photoionization; RABBITT; energy shift; perturbation theory